Source: US Geologcial Survey
"Tree death rates have more than doubled over the last few decades in old-growth forests of the western United States, and the most probable cause of the worrisome trend is regional warming, according to a U.S. Geological Survey-led (USGS) study published in Science on January 23. The study found that the increase in dying trees has been pervasive. Tree death rates have increased across a wide variety of forest types, at all elevations, in trees of all sizes, and in pines, firs, hemlocks, and other kinds of trees."
Tuesday, February 3, 2009
Widespread increase of tree mortality rates in the western United States
Posted by library@EPA at 1:36 PM
Labels: Climate change, Forests